<template>
  <div class="di main-wrap" v-loading="audio.waiting">
    <!-- 这里设置了ref属性后，在vue组件中，就可以用this.$refs.audio来访问该dom元素 -->
    <audio ref="audio" class="dn"
           :src="url" :preload="audio.preload"
           @play="onPlay"
           @error="onError"
           @waiting="onWaiting"
           @pause="onPause"
           @timeupdate="onTimeupdate"
           @loadedmetadata="onLoadedmetadata"
    ></audio>
    <div>
<!--      <el-button v-show="!controlList.noSpeed" type="text" @click="changeSpeed">{{audio.speed | transSpeed}}</el-button>-->

      <el-tag type="info">{{ audio.currentTime | formatSecond}}</el-tag>

      <el-slider v-show="!controlList.noProcess" v-model="sliderTime" :format-tooltip="formatProcessToolTip" @change="changeCurrentTime" class="slider"></el-slider>

      <el-tag style="margin-left: 20px" type="info">{{ audio.maxTime | formatSecond }}</el-tag>

<!--      <el-button v-show="!controlList.noMuted" type="text" @click="startMutedOrNot">{{audio.muted | transMutedOrNot}}</el-button>-->

<!--      <el-slider v-show="!controlList.noVolume" v-model="volume" :format-tooltip="formatVolumeToolTip" @change="changeVolume" class="slider"></el-slider>-->
      <el-button type="danger" style="margin-left: 20px" size="mini"  @click="startPlayOrPause">{{audio.playing | transPlayPause}}</el-button>

      <a :href="url" v-show="!controlList.noDownload" target="_blank" class="download" download>下载</a>
    </div>
  </div>
</template>

<script>
function realFormatSecond(second) {
  var secondType = typeof second

  if (secondType === 'number' || secondType === 'string') {
    second = parseInt(second)

    var hours = Math.floor(second / 3600)
    second = second - hours * 3600
    var mimute = Math.floor(second / 60)
    second = second - mimute * 60

    return hours + ':' + ('0' + mimute).slice(-2) + ':' + ('0' + second).slice(-2)
  } else {
    return '0:00:00'
  }
}

export default {
  props: {
    theUrl: {
      type: String,
      required: true,
    },
    theSpeeds: {
      type: Array,
      default () {
        return [1, 1.5, 2]
      }
    },
    theControlList: {
      type: String,
      default: ''
    }
  },
  name: 'VueAudio',
  data() {
    return {
      url: this.theUrl || 'http://devtest.qiniudn.com/secret base~.mp3',
      audio: {
        currentTime: 0,
        maxTime: 0,
        playing: false,
        muted: false,
        speed: 1,
        waiting: true,
        preload: 'auto'
      },

      sliderTime: 0,
      volume: 100,
      speeds: this.theSpeeds,

      controlList: {
        // 不显示下载
        noDownload: false,
        // 不显示静音
        noMuted: false,
        // 不显示音量条
        noVolume: false,
        // 不显示进度条
        noProcess: false,
        // 只能播放一个
        onlyOnePlaying: false,
        // 不要快进按钮
        noSpeed: false
      }
    }
  },
  methods: {
    setControlList () {
      let controlList = this.theControlList.split(' ')
      controlList.forEach((item) => {
        if(this.controlList[item] !== undefined){
          this.controlList[item] = true
        }
      })
    },
    changeSpeed() {
      let index = this.speeds.indexOf(this.audio.speed) + 1
      this.audio.speed = this.speeds[index % this.speeds.length]
      this.$refs.audio.playbackRate = this.audio.speed
    },
    startMutedOrNot() {
      this.$refs.audio.muted = !this.$refs.audio.muted
      this.audio.muted = this.$refs.audio.muted
    },
    // 音量条toolTip
    formatVolumeToolTip(index) {
      return '音量条: ' + index
    },
    // 进度条toolTip
    formatProcessToolTip(index = 0) {
      index = parseInt(this.audio.maxTime / 100 * index)
      return '进度条: ' + realFormatSecond(index)
    },
    // 音量改变
    changeVolume(index = 0) {
      this.$refs.audio.volume = index / 100
      this.volume = index
    },
    // 播放跳转
    changeCurrentTime(index) {
      this.$refs.audio.currentTime = parseInt(index / 100 * this.audio.maxTime)
    },
    startPlayOrPause() {
      return this.audio.playing ? this.pausePlay() : this.startPlay()
    },
    // 开始播放
    startPlay() {
      this.$refs.audio.play()
    },
    // 暂停
    pausePlay() {
      this.$refs.audio.pause()
    },
    // 当音频暂停
    onPause () {
      this.audio.playing = false
    },
    // 当发生错误, 就出现loading状态
    onError () {
      this.audio.waiting = true
    },
    // 当音频开始等待
    onWaiting (res) {
      console.log(res)
    },
    // 当音频开始播放
    onPlay (res) {
      console.log(res)
      this.audio.playing = true
      this.audio.loading = false

      if(!this.controlList.onlyOnePlaying){
        return
      }

      let target = res.target

      let audios = document.getElementsByTagName('audio');

      [...audios].forEach((item) => {
        if(item !== target){
          item.pause()
        }
      })
    },
    // 当timeupdate事件大概每秒一次，用来更新音频流的当前播放时间
    onTimeupdate(res) {
      // console.log('timeupdate')
      // console.log(res)
      this.audio.currentTime = res.target.currentTime
      this.sliderTime = parseInt(this.audio.currentTime / this.audio.maxTime * 100)
    },
    // 当加载语音流元数据完成后，会触发该事件的回调函数
    // 语音元数据主要是语音的长度之类的数据
    onLoadedmetadata(res) {
      console.log('loadedmetadata')
      console.log(res)
      this.audio.waiting = false
      this.audio.maxTime = parseInt(res.target.duration)
    }
  },
  filters: {
    formatSecond(second = 0) {
      return realFormatSecond(second)
    },
    transPlayPause(value) {
      return value ? '暂停' : '播放'
    },
    transMutedOrNot(value) {
      return value ? '放音' : '静音'
    },
    transSpeed(value) {
      return '快进: x' + value
    }
  },
  created() {
    this.setControlList()
  }
}

</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
.main-wrap{
  padding: 10px 15px;
}
.slider {
  display: inline-block;
  width: 100px;
  position: relative;
  top: 14px;
  margin-left: 15px;
}

.di {
  display: inline-block;
}

.download {
  color: #409EFF;
  margin-left: 15px;
}

.dn{
  display: none;
}

</style>
